Skip to main content
SpringerLink
Log in

Latest HERMES results on transverse spin effects in hadron structure and formation⋆

  • Regular Article - Experimental Physics
  • Published:
The European Physical Journal A Aims and scope Submit manuscript

Abstract

Transverse target single-spin asymmetries in semi-inclusive deep inelastic scattering allow to study the so-called Collins and Sivers mechanisms. The first one connects the poorly known fundamental transversity distribution function, describing the transverse spin-polarization of quarks in a transversely polarized proton, to the Collins fragmentation function, describing spin-orbit correlations in the hadron formation process. The second one is sensitive to the Sivers function, which correlates the intrinsic transverse momentum of quarks with the proton’s spin orientation and is related to the orbital angular momentum of quarks. Preliminary results on azimuthal single target-spin asymmetries in semi-inclusive electro-production of pions and kaons at the HERMES experiment are presented. The full data set collected with a transversely polarized hydrogen target was analyzed providing the HERMES most precise results on the Collins and Sivers azimuthal moments.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. HERMES Collaboration (A. Airapetian), Phys. Rev. D 71, 012003 (2005).

    Google Scholar 

  2. J.P. Ralston, D.E. Soper, Nucl. Phys. B 152, 109 (1979).

    Google Scholar 

  3. V. Barone, A. Drago, G. Ratcliffe, Phys. Rep. 359, 1 (2002).

    Google Scholar 

  4. J.C. Collins, Nucl. Phys. B 396, 161 (1993).

    Google Scholar 

  5. D.W. Sivers, Phys. Rev D 41, 83 (1990).

    Google Scholar 

  6. S.J. Brodsky, D.S. Hwang, I. Schmidt, Phys. Lett. B 530, 99 (2002).

    Google Scholar 

  7. M. Burkardt, Phys. Rev. D 66, 114005 (2002).

    Google Scholar 

  8. HERMES Collaboration (A. Airapetian), Nucl. Instrum. Methods A 540, 68 (2005).

    Google Scholar 

  9. HERMES Collaboration (K. Ackerstaff), Nucl. Instrum. Methods A 417, 230 (1998).

    Google Scholar 

  10. HERMES Collaboration (A. Airapetian), Phys. Rev. Lett. 94, 012002 (2005).

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Dipartimento di Fisica, Polo Scientifico e Tecnologico - Edifico C, Università degli Studi di Ferrara, Via Saragat, 1, 44100, Ferrara, Italy

    L. L. Pappalardo

Authors
  1. L. L. Pappalardo
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to L. L. Pappalardo.

Additional information

M. Anselmino

Original article based on material presented at HADRON 2007.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Pappalardo, L.L. Latest HERMES results on transverse spin effects in hadron structure and formation⋆ . Eur. Phys. J. A 38, 145–148 (2008). https://doi.org/10.1140/epja/i2008-10575-8

Download citation

  • Received:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1140/epja/i2008-10575-8

PACS

Search

Navigation